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No. 609,734. Patented Aug. 23, I898.

C. T. CHOWDER. APPARATUS FOR MAKING TUBULAR JOINTS.

(Application filed In. 14, 1898.)

(No Model.) 3 Sheets$heet I.

m: nonms PETEflS co? PNOTO-LITNU.. WASNINGTQN. n. c.

No. 609,734. Patented Aug. 23, I898.

' C. T. CBOWDEN.

APPARATUS FOR MAKING TUBULAR JOINTS.

(Application filed Mar. 14, 1898.)

(No Model.)

3 Sheets-Sheet 2.

@ZMUW No. 609,734. Patented Au 23, I898. c. T. snowman.

APPARATUS FOR MAKING TUBULAR JOINTS. (Application filed Mar. 14, 1898.)

-N1TED- STATES PATENT OFFICE.

CHARLES THOMAS GROWDEN, OF LEAMINGTON SPA, ENGLAND.

APPARATUS FOR MAKING TUBULAR JOINTS.

SPECIFICATION forming part of Letters Patent No. 609,734, dated August23, 1898.

Application filed March 14., 1898.

To all whom it may concern.-

Be it known that 1, CHARLES THOMAS GROWDEN, a subject of the Queen ofEngland residing at Leamington Spa, England, have invented certain newand useful Improvements in Apparatus for Making Tubular Joints, (forwhich I have made application in England under No. 6,540, dated March12, 1897,) of which the following is a specification.

This invention relates to the making of tubular joints where one tube isplaced inside another tube and parts of the two are forced into eachother by direct hydraulic pressure.

In my previous British applications, No. 22,721 of 1895 and No. 13,577of 1896, I havedescribed various ways of making joints of thisdescription. My present invention relates to the apparatus and themanner of operating it.

In carrying out my present invention I employ a suitable jig or mold,into which the parts of the joint or joints are placed, or, if desired,a complete framework of a cycle, for example, may be placed in asuitable jig and all the joints made at once. The jig must be dividedwhere necessary to give access to the interior for the insertion orremoval of the parts to be joined, and in my previous applications Iindicate the fastening of the various parts of the mold together bymeans of bolts. By my present invention I do not hold the parts togetherby bolts, but by hydraulic pressure. I employ a suitably-constructed,hydraulic press, and to the base or fixed table of this I secure one ormore parts of the jig, and to the head of the ram or movable table Isecure another part or parts. When the pressure is applied, the ramdescends and brings the two parts of the mold to-' gether, the pressureof the ram holding'them in tightcontact. Thepressureformakingthe jointsmay be then applied in substantially the manner already described insaid previous applications.

If desired, the press may be made in more than two parts, and more thanone ram and more than one fixed part may be employed. For instance,where it is desired to remove a particular portion of the frame in adirection other than that of the axial line of the press I may haveanother ram operating in a path,

Serial No. 673,861. (No model.)

say, perpendicular to that of the first ram, so

as to draw a particular portion or portions of the jig or mold out inthe required direction.

The portions of the jig may be bolted to the respective portions of thepress, or they may be merely fitted in and held by any convenient means.In the case of the bottom portion 110 special means are necessary forholding the jig, as it is merely necessary that it should be fitted uponthe table in the proper position. In the movable parts, where the partof the jig would have to be raised, means suflicient to overcome theweight of the portion of the jig which was raised would be necessary.

One valve or set of valves may be employed for operating the rams andanother valve or set of valves for controlling the pressure for makingthe joints, or the same valve or valves may be arranged to control thewhole ofthe pressure.

In the accompanying drawings, Figure l is'an elevation, partly insection, of the im proved apparatus employed for making tubular joints.Fig. 2 is a plan of the same. Fig. 3 is a View showing the main lowerdie in plan and the supplemental die in section, taken on thedividing-line of the main dies, with a portion of the bicycle-frameshown in position in the dies.

Like letters indicate like parts throughout the drawings.

Above a table A is arranged a cylinder 13, in which is a hydraulic ram0, connected to a movable table 0'. On the inner end of the ram 0 is anextension 0 which passes through into a small cylinder B on the end ofthe cylinder B, being there provided with a piston 0 A low pressure mainD leads into a con necting-piece' E, being provided at its point ofentrance with a back-pressure valve D.

From the connecting-piece E lead three pipes, one F passing through thecylinder B, a second pipe G being connected to the highpressurehydraulic main H and to the cy1inder B, while a third pipe J leads tothe inte= rior of the jig or mold and communicates with the interior ofthe articles to be united.

The two main parts K K of the jig or mold are attached to the fixedtable A and movable table 0, respectively.

A three-part jig is shown in the example,

IOO

the subsidiary part K being acted upon by a ram L in a cylinder L. i

To operate the apparatus, the high-pressure main is shut ofi,low-pressure water being admitted through the pipe D and valve D, pipeF, and cock-valve F into the cylinder B, the

pipe J to the interior of the sections of the joint to be made containedwithin the diecavity of the mold, thereby forcing the jointsections intounion, the hydraulic ram 0 holding the sections of the mold togetheragainst the pressure exerted in forcing the joint-sections into union.

If a three or more part jig is employed, power is admitted to thesupplementary cylinder or cylinders at the same time as to the maincylinder B.

It is to be noted that the cross-sectional area of the ram 0 is greaterthan the corresponding interior portionof the mold or jig which issubjected to the like hydraulic pressure as the ram.

It is not necessary to employ low-pressure water for raising the ram andpart of the jig so long as the operation is performed hydraulically.

It is to be understood that the details of the apparatus may be variedin accordance with requirements without departing from the spirit of theinvention.

Having now particularly described and ascertained the nature of the saidinvention and in what manner the same is to' be performed, I declarethat what I claim is- In an apparatus such as described the 00111-bination with the sectional mold having the die-cavity of the shape toreceive the sections of the joint to be made, formed in the adjacentfaces of the mold-sections, with means for supplying hydraulic pressureto the interior of the joint-sections contained in the diecavity and ahydraulic ram for holding the mold-sections together against the.pressure exerted in forcing the joint-sections contained in thedie-cavity into union; substantially as described.

In testimony whereof I have hereto set my hand in the presence of thetwo subscribing witnesses.

CHARLES THOMAS OROWDEN.

Witnesses:

J. A. MORGAN, FRED C.'HARRIS.

